The individual mailinglist (regional/specialty)
pages have migrated to a
new home at the ABA site.
The Rare Bird Alerts link, however, remains live, as do
the search engines and the eBird Rarity map.
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Bird Sense, subtitled "What It's Like To Be a Bird", by Tim
Birkhead, has chapters on Hearing, Seeing, Touch, Taste, Smell,
Magnetic Sense and Emotions and there's a jaw-dropping surprise on
practically every page. Highly entertaining and informative.
Guardian review>

Boreal Birds of North America , is more academic, being a
collection of articles by a variety of authors discussing various
aspects of ornithology relating to boreal species. Lots of charts
and tables describing the particular problems these species face.